大理岩三轴压缩试验过程中氡释放规律研究  

Experimental study on the regularity of radon release from marble under triaxial compression

作　　者：李玲玉 张传庆[1,2] 崔国建 周辉[1,2] 高阳 胡大伟[1,2] 卢景景 LI Lingyu;ZHANG Chuanqing;CUI Guojian;ZHOU Hui;GAO Yang;HU Dawei;LU Jingjing(State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071 [2]中国科学院大学,北京100049

出　　处：《岩石力学与工程学报》2022年第9期1888-1897,共10页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金–雅砻江联合基金重点项目(U1865203);国家自然科学基金资助项目(52009128);中国科学院前沿科学重点研究计划项目(ZDBS-LY-DQC022)。

摘　　要：氡气是地下空间开发利用中的有害气体,同时对深地暗物质试验有重要影响,研究地下工程开挖过程中氡释放规律是科学解决氡污染问题的基础。采用自主设计的岩石三轴压缩氡释放试验系统,开展大理岩不同围压下三轴压缩破裂试验与氡释放量的测试,研究大理岩破裂模式对氡释放规律的影响,并讨论岩石破坏接近度(FAI)与累积氡浓度的相关性。试验结果表明,大理岩在不同加载阶段的氡释放量具有显著差异,总体上呈现先增加后回落再大幅增加至峰值释放量,最后跌落至稳定水平的规律。初始氡浓度随着围压的升高逐渐升高,而峰值氡浓度随着围压的升高呈现逐渐下降的趋势,与不同围压下岩石的破坏模式相关。通过对试验结果分析,得到岩石破坏接近度与累积氡浓度具有明显的相关性,可通过破坏接近度预测累积氡浓度的变化趋势。岩石氡释放规律的揭示对现场排氡/隔氡设计具有重要指导意义。Radon is harmful in the development and utilization of underground space,and it has an important influence on the deep dark matter experiment. Studying the regularity of radon release during underground excavation is the basis of solving radon pollution problems. To study the influence of marble fracture mode on radon release,triaxial compression and radon release tests of marble specimens under different confining pressures were carried out by the self-designed rock triaxial compression radon release test system,and the relationship between Failure Approach Index and accumulative radon concentration was discussed. The results show that significant differences exist in the characteristics of radon release from marble samples at different loading stages under triaxial compression,showing a trend of increasing firstly,then decreasing slightly,next increasing sharply to the peak release,and finally dropping to a lower level. The initial radon emission gradually increases with the increase of the confining pressure,while the peak radon emission gradually decreases with the increase of the confining pressure which is related to the failure mode of rock under different confining pressures. It is found that there is a correlation between Failure Approach Index and accumulative radon concentration by fitting the experimental data,and the change trend of radon emission can be predicted by the failure approach index curve. It is of great significance to reveal the law of radon release in rock for the design of radon discharge/radon isolation.

关 键 词：岩石力学 氡释放 大理岩 三轴压缩 声发射 破坏接近度 

分 类 号：TU45[建筑科学—岩土工程]